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                <h3 id="语法研究"><a href="#语法研究" class="headerlink" title="语法研究"></a>语法研究</h3><blockquote>
<p><a target="_blank" rel="noopener" href="https://www.w3.org/TR/2011/REC-CSS2-20110607/">Cascading Style Sheets Level 2 Revision 1 (CSS 2.1) Specification</a></p>
<p><a target="_blank" rel="noopener" href="https://www.w3.org/TR/2011/REC-CSS2-20110607/grammar.html#q25.0">Appendix G. Grammar of CSS 2.1</a></p>
</blockquote>
<h4 id="CSS-总体结构"><a href="#CSS-总体结构" class="headerlink" title="CSS 总体结构"></a>CSS 总体结构</h4><ul>
<li><a href="/charset">@charset </a></li>
<li><a href="/import">@import </a></li>
<li>rules<ul>
<li><a href="/media">@media </a></li>
<li><a href="/page">@page </a></li>
<li>rule（normal rules）</li>
</ul>
</li>
</ul>
<p><img src="https://cdn.nlark.com/yuque/0/2021/png/250093/1639641953327-ae6f970e-77b4-4039-976f-53239859645a.png#clientId=uaf200a23-456d-4&amp;from=ui&amp;id=u47f0a1d1&amp;originHeight=1328&amp;originWidth=2188&amp;originalType=binary∶=1&amp;size=296968&amp;status=done&amp;style=none&amp;taskId=u50811936-0988-4072-9e23-4285dcbaf4c" alt="CSS.png"></p>
<h3 id="CSS-规则的研究"><a href="#CSS-规则的研究" class="headerlink" title="CSS @规则的研究"></a><a target="_blank" rel="noopener" href="https://developer.mozilla.org/en-US/docs/Web/CSS/At-rule">CSS @规则的研究</a></h3><ul>
<li><a href="/charset">@charset </a></li>
<li><a href="/import">@import </a></li>
<li><a href="/media">@media </a></li>
<li><a href="/page">@page </a></li>
<li><a href="/namespace">@namespace </a></li>
<li><a href="/supports">@supports </a></li>
<li><a href="/font-face">@font-face </a></li>
<li><a href="/keyframes">@keyframes </a></li>
<li><a href="/document">@document </a></li>
<li><a href="/counter-style">@counter-style </a></li>
</ul>
<h3 id="CSS-规则的结构"><a href="#CSS-规则的结构" class="headerlink" title="CSS 规则的结构"></a>CSS 规则的结构</h3><ul>
<li>Selector</li>
<li>Key<ul>
<li>Properties</li>
<li>Variables</li>
</ul>
</li>
<li>Value</li>
</ul>
<h4 id="收集-CSS-标准"><a href="#收集-CSS-标准" class="headerlink" title="收集 CSS 标准"></a><a target="_blank" rel="noopener" href="https://www.w3.org/TR/?tag=css">收集 CSS 标准</a></h4><pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token comment">// 从上面的网站收集CSS标准</span>
<span class="token keyword">let</span> list <span class="token operator">=</span> document<span class="token punctuation">.</span><span class="token function">getElementById</span><span class="token punctuation">(</span><span class="token string">"container"</span><span class="token punctuation">)</span><span class="token punctuation">.</span>children<span class="token punctuation">;</span>

<span class="token keyword">let</span> result <span class="token operator">=</span> <span class="token punctuation">[</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
<span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token keyword">let</span> li <span class="token keyword">of</span> list<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span>li<span class="token punctuation">.</span><span class="token function">getAttribute</span><span class="token punctuation">(</span><span class="token string">"data-tag"</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">match</span><span class="token punctuation">(</span><span class="token regex"><span class="token regex-delimiter">/</span><span class="token regex-source language-regex">css</span><span class="token regex-delimiter">/</span></span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    result<span class="token punctuation">.</span><span class="token function">push</span><span class="token punctuation">(</span><span class="token punctuation">&#123;</span>
      <span class="token literal-property property">name</span><span class="token operator">:</span> li<span class="token punctuation">.</span>children<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">.</span>innerText<span class="token punctuation">,</span>
      <span class="token literal-property property">url</span><span class="token operator">:</span> li<span class="token punctuation">.</span>children<span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">.</span>children<span class="token punctuation">[</span><span class="token number">0</span><span class="token punctuation">]</span><span class="token punctuation">.</span>href<span class="token punctuation">,</span>
    <span class="token punctuation">&#125;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span>
console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token constant">JSON</span><span class="token punctuation">.</span><span class="token function">stringify</span><span class="token punctuation">(</span>result<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h5 id="结果"><a href="#结果" class="headerlink" title="结果"></a>结果</h5><pre class="line-numbers language-json" data-language="json"><code class="language-json"><span class="token punctuation">[</span>
  <span class="token punctuation">&#123;</span>
    <span class="token property">"name"</span><span class="token operator">:</span> <span class="token string">"CSS Multi-column Layout Module Level 1"</span><span class="token punctuation">,</span>
    <span class="token property">"url"</span><span class="token operator">:</span> <span class="token string">"https://www.w3.org/TR/2021/CR-css-multicol-1-20211012/"</span>
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
  <span class="token punctuation">&#123;</span>
    <span class="token property">"name"</span><span class="token operator">:</span> <span class="token string">"CSS Values and Units Module Level 4"</span><span class="token punctuation">,</span>
    <span class="token property">"url"</span><span class="token operator">:</span> <span class="token string">"https://www.w3.org/TR/2021/WD-css-values-4-20210930/"</span>
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
  <span class="token punctuation">&#123;</span>
    <span class="token property">"name"</span><span class="token operator">:</span> <span class="token string">"CSS Scrollbars Styling Module Level 1"</span><span class="token punctuation">,</span>
    <span class="token property">"url"</span><span class="token operator">:</span> <span class="token string">"https://www.w3.org/TR/2021/WD-css-scrollbars-1-20210908/"</span>
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
  <span class="token punctuation">&#123;</span>
    <span class="token property">"name"</span><span class="token operator">:</span> <span class="token string">"CSS Display Module Level 3"</span><span class="token punctuation">,</span>
    <span class="token property">"url"</span><span class="token operator">:</span> <span class="token string">"https://www.w3.org/TR/2021/CRD-css-display-3-20210903/"</span>
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
  <span class="token punctuation">&#123;</span>
    <span class="token property">"name"</span><span class="token operator">:</span> <span class="token string">"CSS Nesting Module"</span><span class="token punctuation">,</span>
    <span class="token property">"url"</span><span class="token operator">:</span> <span class="token string">"https://www.w3.org/TR/2021/WD-css-nesting-1-20210831/"</span>
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
  <span class="token punctuation">&#123;</span>
    <span class="token property">"name"</span><span class="token operator">:</span> <span class="token string">"CSS Cascading and Inheritance Level 5"</span><span class="token punctuation">,</span>
    <span class="token property">"url"</span><span class="token operator">:</span> <span class="token string">"https://www.w3.org/TR/2021/WD-css-cascade-5-20210829/"</span>
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
  <span class="token punctuation">&#123;</span>
    <span class="token property">"name"</span><span class="token operator">:</span> <span class="token string">"CSS Object Model (CSSOM)"</span><span class="token punctuation">,</span>
    <span class="token property">"url"</span><span class="token operator">:</span> <span class="token string">"https://www.w3.org/TR/2021/WD-cssom-1-20210826/"</span>
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
  <span class="token punctuation">&#123;</span>
    <span class="token property">"name"</span><span class="token operator">:</span> <span class="token string">"CSS Masking Module Level 1"</span><span class="token punctuation">,</span>
    <span class="token property">"url"</span><span class="token operator">:</span> <span class="token string">"https://www.w3.org/TR/2021/CRD-css-masking-1-20210805/"</span>
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
  <span class="token punctuation">&#123;</span>
    <span class="token property">"name"</span><span class="token operator">:</span> <span class="token string">"CSS Color Module Level 3"</span><span class="token punctuation">,</span>
    <span class="token property">"url"</span><span class="token operator">:</span> <span class="token string">"https://www.w3.org/TR/2021/REC-css-color-3-20210805/"</span>
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
  <span class="token punctuation">&#123;</span>
    <span class="token property">"name"</span><span class="token operator">:</span> <span class="token string">"CSS Fonts Module Level 4"</span><span class="token punctuation">,</span>
    <span class="token property">"url"</span><span class="token operator">:</span> <span class="token string">"https://www.w3.org/TR/2021/WD-css-fonts-4-20210729/"</span>
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
  <span class="token punctuation">&#123;</span>
    <span class="token property">"name"</span><span class="token operator">:</span> <span class="token string">"CSS Fonts Module Level 5"</span><span class="token punctuation">,</span>
    <span class="token property">"url"</span><span class="token operator">:</span> <span class="token string">"https://www.w3.org/TR/2021/WD-css-fonts-5-20210729/"</span>
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
  <span class="token punctuation">&#123;</span>
    <span class="token property">"name"</span><span class="token operator">:</span> <span class="token string">"Worklets  Level 1"</span><span class="token punctuation">,</span>
    <span class="token property">"url"</span><span class="token operator">:</span> <span class="token string">"https://www.w3.org/TR/2021/NOTE-worklets-1-20210729/"</span>
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
  <span class="token punctuation">&#123;</span>
    <span class="token property">"name"</span><span class="token operator">:</span> <span class="token string">"CSS Counter Styles Level 3"</span><span class="token punctuation">,</span>
    <span class="token property">"url"</span><span class="token operator">:</span> <span class="token string">"https://www.w3.org/TR/2021/CR-css-counter-styles-3-20210727/"</span>
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
  <span class="token punctuation">&#123;</span>
    <span class="token property">"name"</span><span class="token operator">:</span> <span class="token string">"CSS Backgrounds and Borders Module Level 3"</span><span class="token punctuation">,</span>
    <span class="token property">"url"</span><span class="token operator">:</span> <span class="token string">"https://www.w3.org/TR/2021/CRD-css-backgrounds-3-20210726/"</span>
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
  <span class="token punctuation">&#123;</span>
    <span class="token property">"name"</span><span class="token operator">:</span> <span class="token string">"CSS Color Module Level 5"</span><span class="token punctuation">,</span>
    <span class="token property">"url"</span><span class="token operator">:</span> <span class="token string">"https://www.w3.org/TR/2021/WD-css-color-5-20210722/"</span>
  <span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
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span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h4 id="收集-CSS-属性标准？？"><a href="#收集-CSS-属性标准？？" class="headerlink" title="收集 CSS 属性标准？？"></a>收集 CSS 属性标准？？</h4>
                
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